## Step by action solution for calculating 21 is 25 percent of what number

We already have our first worth 21 and the second value 25. Let"s assume the unrecognized worth is Y which answer we will discover out.

You are watching: Twenty-one is 25% of

As we have actually all the compelled values we need, Now we deserve to put them in a basic mathematical formula as below:

STEP 1 21 = 25% × Y

STEP 2 21 = 25/100× Y

Multiplying both sides by 100 and also splitting both sides of the equation by 25 we will certainly arrive at:

STEP 3 Y = 21 × 100/25

STEP 4 Y = 21 × 100 ÷ 25

STEP 5 Y = 84

Finally, we have discovered the value of Y which is 84 and also that is our answer.

You deserve to easily calculate 21 is 25 percent of what number by using any type of continual calculator, simply enter 21 × 100 ÷ 25 and you will gain your answer which is 84

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## Sample concerns, answers, and just how to

Question: Your frifinish has a bag of marbles, and also he tells you that 25 percent of the marbles are red. If there are 21 red marbles. How many marbles does he have altogether?

Answer: 84 marbles.

How To: In this trouble, we understand that the Percent is 25, and we are likewise told that the Part of the marbles is red, so we recognize that the Part is 21.

So, that suggests that it have to be the Total that"s lacking. Here is the way to figure out what the Total is:

Part/Total = Percent/100

By utilizing an easy algebra we have the right to re-arselection our Percent equation prefer this:

Part × 100/Percent = Total

If we take the "Part" and multiply it by 100, and then we divide that by the "Percent", we will certainly get the "Total".

Let"s attempt it out on our trouble around the marbles, that"s extremely easy and it"s just 2 steps! We know that the "Part" (red marbles) is 21.

So action one is to simply multiply that Part by 100.

21 × 100 = 2100

In action two, we take that 2100 and divide it by the "Percent", which we are told is 25.

So, 2100 separated by 25 = 84

And that indicates that the total number of marbles is 84.

Question: A high school marching band has actually 21 flute players, If 25 percent of the band also members play the flute, then just how many members are in the band?

Answer: There are 84 members in the band also.

How To: The smaller "Part" in this trouble is 21 because tbelow are 21 flute players and also we are told that they comprise 25 percent of the band, so the "Percent" is 25.

Again, it"s the "Total" that"s absent below, and to uncover it, we simply should follow our 2 step procedure as the previous trouble.

For step one, we multiply the "Part" by 100.

21 × 100 = 2100

For action 2, we divide that 2100 by the "Percent", which is 25.

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2100 split by 25 equals 84

That means that the total variety of band members is 84.

## Have time and desire to learn the calculation?

Let"s assume the unwell-known value is Y

First creating it as: 100% / Y = 25% / 21

Drop the percentage marks to simplify your calculations: 100 / Y = 25 / 21

Multiply both sides by Y to relocate Y on the ideal side of the equation: 100 = ( 25 / 21 ) Y